JP6392619B2 - Hot water storage water heater - Google Patents

Description

  The present invention relates to a hot water storage type hot water supply apparatus that performs a reheating operation of bathtub water using hot water in a hot water storage tank as a heat source.

  Conventionally, in this type of hot water storage hot water supply apparatus, as disclosed in Patent Document 1, a hot water storage tank for storing hot water, heating means for circulating and heating hot water in the hot water storage tank, and hot water in the hot water storage tank are disclosed. A bath heat exchanger that heats the bath water using the heat source as a heat source, a bath circulation circuit that connects the bathtub and the bath heat exchanger so that the bath water can circulate, a bath circulation pump provided in the middle of the bath circulation circuit, and a bath circulation A reheating control means for driving the pump to heat the bathtub water and reheating it. Based on the past hot water supply results and renewal results, the temperature rises when there is a reheating result The temperature is determined and the boiling operation is performed in which the hot water heated to the boiling temperature by the heating means is stored in the hot water storage tank in the midnight time zone, and the remaining hot water in the hot water storage tank is reduced in the time zone other than the midnight time zone. In this case, the hot water heated up to the boiling temperature based on the past hot water supply results and reheating results is stored in the hot water storage tank, and the reheating operation is performed to ensure the reheating heating capacity of the bath water. was there.

JP 2007-3162 A

  However, in this conventional system, since boiling is performed at a high boiling temperature in consideration of the renewal performance from midnight hours, generally the bath water replenishment operation after the evening is started from the midnight boiling start time. A large amount of heat was dissipated in the long time until the start, and there was a problem that heat loss was large and inefficient.

In order to solve the above problems, the present invention provides a hot water storage tank for storing hot water, a water supply pipe for supplying water to the lower part of the hot water storage tank, a hot water supply pipe for supplying hot water from the upper part of the hot water storage tank, and hot water in the hot water storage tank. Heating means for heating, a heating circulation circuit connecting the lower part of the hot water storage tank, the heating means and the upper part of the hot water storage tank, a heating circulation pump provided in the middle of the heating circulation circuit, and hot water in the hot water storage tank A bath heat exchanger that heats the bath water as a heat source, a bath circulation circuit that connects the bathtub and the bath heat exchanger so that the bath water can circulate, a bath circulation pump provided in the middle of the bath circulation circuit, and A hot water storage temperature sensor that detects the temperature of hot water in the hot water storage tank, a reheating control means that drives the bath circulation pump to heat the bath water, and a reheating control means that performs the reheating operation Reheating execution time storage means for storing the earliest time for a plurality of days in the past, and boiling for storing hot water heated to the boiling temperature by driving the heating means and the heating circulation pump in the midnight time zone in the hot water storage tank Boiling control means for performing a heating operation, boiling temperature determining means for determining the boiling temperature from past hot water supply results, and boiling for determining whether or not boiling is necessary based on the output of the hot water storage temperature sensor When the increase determination means and the increase determination means determine that the increase in boiling time is necessary in a time zone other than midnight, the heating means and the heating circulation pump are driven to store hot water heated to the increase temperature in the hot water storage tank. If the reheating control means for performing reheating operation and the reheating execution time storage means does not store reheating execution time, the reheating temperature is set to the reheating temperature. In the case where the boiling temperature determined by the reheating temperature determining means is used and the reheating execution time storage means stores the reheating execution time, the reheating execution stored in the renewal execution time storage means is stored. The earliest time among the times is discriminated, and a time earlier than the earliest time by a certain time is set as the reheating temperature change time, and the boiling temperature is raised in the time zone before this reheating temperature change time. The boiling temperature determined by the temperature determining means is used, and during the period from the time when the reheating temperature is changed to a predetermined time, the reheating temperature is set to a predetermined reheating temperature higher than the boiling temperature. And a boiling temperature determining means.

  Further, the reheating time storage means stores the time when a reheating operation is performed in which the temperature of the bath water is raised to a predetermined temperature or more.

  Further, the predetermined reheating temperature is a temperature obtained by adding a predetermined temperature to the boiling temperature determined by the boiling temperature determining means.

  Further, when the predetermined reheating temperature exceeds a predetermined upper limit temperature, the predetermined upper limit temperature is set as a predetermined reheating temperature.

  According to the present invention, since the boiling temperature is changed to a higher temperature from the time zone before the time zone in which the tracking operation has been performed, the midnight time is until immediately before the time zone in which the driving operation will be started. It is heated and heated at a relatively low temperature, including the boiling temperature of the belt, and heat loss radiated from the hot water storage tank before the start of the reheating operation can be reduced, and the reheating performance has been proven. Immediately before, the temperature is increased at the reheating temperature, and the capability of reheating operation can be appropriately secured. .

  In addition, when the reheating operation time storage means performs the reheating operation in which the temperature of the bath water is raised to a predetermined temperature or more, the time is stored, so the amount of heat consumed in the reheating operation is large. When it is estimated that there is a need to increase the boiling temperature, when the boiling temperature is increased, the amount of heat consumed in the reheating operation is small, and there is no need to increase the boiling temperature. Since the boiling temperature is not increased, the chance of unnecessarily increasing the temperature can be suppressed.

Schematic configuration diagram of one embodiment of the present invention Control block diagram of the same embodiment Flow chart for explaining the operation of the same embodiment

Next, an embodiment of the present invention will be described with reference to the drawings.
1 is a hot water storage tank for storing hot water, 2 is a water supply pipe for supplying water to the lower part of the hot water storage tank 1, 3 is a hot water discharge pipe for discharging hot water from the upper part of the hot water storage tank 1, 4 is a water supply bypass pipe branched from the water supply pipe 2, A hot water mixing valve 6 for mixing the hot water from the hot water discharge pipe 3 and the water from the water supply bypass pipe 4 is a hot water supply pipe for guiding the hot water mixed by the hot water supply mixing valve 5 to the hot water tap 7.

  8 is a hot water temperature sensor for detecting the temperature of hot water mixed by the mixing valve 5, 9 is a hot water flow rate sensor for detecting the flow rate of hot water flowing through the hot water supply pipe 6, and 10 is the temperature of water flowing through the water supply bypass pipe 4. A plurality of hot water storage temperature sensors 11 a to e are provided on the upper and lower sides of the hot water storage tank 1 to detect the hot water storage temperature of the hot water storage tank 1, and the hot water storage temperature sensor 11 e at the bottom of the hot water storage tank 1 is heated. It functions as an end-of-boiling temperature sensor that determines the end of operation. A pressure reducing valve 12 is provided in the water supply pipe 2 to reduce the water supply pressure, and 13 is an overpressure relief valve that is provided in a pipe line communicating with the hot water storage tank 1 to release the overpressure in the hot water storage tank 1.

  14 is a bath heat exchanger disposed in the upper part of the hot water storage tank 1 to circulate and heat the bath water in the bath 15, and 16 is connected to the bath 15 and the bath heat exchanger 14 so that the bath water can circulate. A bath circulation circuit 17 is provided in the middle of the bath circulation circuit 16 and circulates the bath water, 18 is a bath temperature sensor provided on the suction side of the bath circulation pump 17 and detects the temperature of the bath water, 19 Is a water level sensor for detecting the water level in the bathtub 15.

  Reference numeral 20 denotes a hot water filling pipe branched from the hot water supply flow rate sensor 9 of the hot water supply pipe 6 and connected to the bath circulation circuit 16, and 21 is a hot water solenoid valve provided in the middle of the hot water filling pipe 20.

  22 is a heating circulation circuit that circulates hot water from the lower part of the hot water storage tank 1 and returns it to the upper part of the hot water storage tank 1, 23 is a refrigerant water heat exchanger provided in the middle of the heating circulation circuit 22 for heating the circulating hot water, 24 is a heating circulation pump provided on the upstream side of the refrigerant water heat exchanger 23 in the heating circulation circuit 22, 25 is an incoming water temperature sensor for detecting the temperature of water flowing into the refrigerant water heat exchanger 23, and 26 is refrigerant water. It is a boiling temperature sensor that detects the temperature of hot water heated by the heat exchanger 23.

  27 is a compressor that compresses the refrigerant and pumps the refrigerant to the primary side of the refrigerant water heat exchanger 23, 28 is an expansion valve that expands the refrigerant flowing out of the refrigerant water heat exchanger 23, and 29 is a refrigerant expanded by the expansion valve 28. An air heat exchanger as an evaporator for evaporating the refrigerant, 30 is a refrigerant pipe connecting the primary side of the compressor 27 and the water refrigerant heat exchanger 23, the expansion valve 28 and the air heat exchanger 29 in an annular shape, 31 is air heat A blower 32 that blows air serving as a heating source to the exchanger 29 is an outside air temperature sensor that detects the outside air temperature, and these elements constitute a heat pump type heating means 33.

  34 is a remote controller for performing hot water supply temperature and various necessary settings, a display unit 35 for displaying hot water supply set temperature and bath set temperature, a temperature change switch 36 for changing hot water set temperature and bath set temperature, Bath switch 37 for automatically bathing the bath 15 at a predetermined water level and keeping the bath setting temperature automatically, and the reheating operation for heating the bath water to the bath setting temperature + α ° C. A switch 38 and a remote controller 39 for controlling the operation of the remote controller 34 are provided.

  Reference numeral 40 denotes a control unit for controlling the operation of the hot water storage type hot water supply apparatus, which stores a program for controlling the operation in advance and has an MPU having a calculation, comparison, storage function, and count function, Sensor 8, hot water supply flow rate sensor 9, water supply temperature sensor 10, hot water storage temperature sensors 11 a to 11 e, bath temperature sensor 18, water level sensor 19, incoming water temperature sensor 25, boiling temperature sensor 26, and outside air temperature sensor 32 Is input, and control of driving of the hot water mixing valve 5, the bath circulation pump 17, the hot water on / off valve 21, the heating circulation pump 24, the compressor 27, the expansion valve 28, and the blower 31 is performed, and the heating operation, the hot water operation and the bath operation are performed. Are connected to the remote control unit 39 of the remote controller 34 so as to be communicable.

  Next, a characteristic configuration of the present invention provided in the control unit 40 will be described based on the control block diagram of FIG.

  When 41 receives a signal indicating that the reheating switch 38 of the remote controller 34 has been turned on from the remote control unit 39, the bath circulation pump 17 is driven to bring the bath water to the bath set temperature + α ° C. by the bath heat exchanger 14. This is a reheating control means for performing reheating operation for heating.

  42 is a chasing execution time storage means for storing the time t1 when the chasing control means 41 performs the chasing operation for the first time in a day for a plurality of recent days (for example, for seven days). The means 42 stores the time t1 at which the reheating operation is performed when the bath water is heated at a predetermined temperature (for example, 5 ° C.) or higher or when it is determined that it is necessary to increase the temperature at a predetermined temperature or higher. It is what you are doing.

  43 is a boiling temperature determining means for determining Ta the boiling temperature from data for a past predetermined period such as the hot water supply results based on the outputs of the hot water temperature sensor 8 and the hot water flow rate sensor 9, and 44 is a heat pump heating means in the midnight time zone. 33 is a heating control means for performing a heating operation in which the hot water heated to the boiling temperature Ta is returned from the upper part to the hot water storage tank 1 to store a necessary amount of hot water by driving the heating circulation pump 24 and the heating circulation pump 24. .

  45 detects from the temperature distribution state in the hot water storage tank 1 detected by the hot water storage temperature sensors 11a to 11e in a time zone other than the midnight time zone, that there is a certain amount or more of water flowing into the lower part of the hot water storage tank 1 due to hot water supply. Then, it is judged that the water can be heated up, and the amount of hot water necessary for the day is completed in the water heating operation in the midnight time zone and the heating operation in the time zone other than the midnight time zone. In the case where the heating increase operation is not performed, the boiling increase determination means 46 determines that the increase in boiling operation is required. When the increase determination means 45 determines that the increase in boiling is required, the heat pump type heating means 33 and the heating circulation pump 24 are driven. This is a reheating control means for performing reheating operation for returning the hot water heated to the reheating temperature Tb from the upper part to the hot water storage tank 1 and storing the required amount of hot water for the remaining one day.

  47, when the reheating execution time storage means 42 does not store the renewal execution time t1, the boiling increase temperature Tb is set to the boiling temperature Ta determined by the boiling temperature determination means 43, and the renewal execution time is set. When the storage means 42 stores the chasing execution time t1, the earliest time t1n of the chasing execution time t1 stored in the chasing execution time storage means 42 is determined, and the earliest time t1n. A time that is earlier than a certain time (for example, 3 hours) is set as the temperature change time t2, and the temperature is increased after the end time of the midnight time zone until the temperature change time t2 is reached. The heating temperature Ta determined at 43 is set, and the heating temperature change time t2 to a predetermined time t3 (for example, 23:00 as the start time of the midnight time zone) A boiling temperature determining means for setting the boiling temperature Tb to a predetermined reheating temperature Tn, where a predetermined upper limit temperature (for example, 90 ° C. as an upper limit temperature in the specification of the heat pump type heating means 33) is set as an upper limit. The temperature obtained by adding a predetermined temperature (for example, 5 ° C.) to the boiling temperature Ta determined by the boiling temperature determination means 43 is set as a predetermined reheating temperature Tn.

<Hot-water supply operation>
Next, operation during hot water supply will be described. When the hot water tap 7 is opened, water from the water supply pipe 2 flows into the bottom of the hot water storage tank 1, and hot water at the top of the hot water storage tank 1 flows out from the hot water supply pipe 3, and from the water supply bypass pipe 4 by the hot water mixing valve 5. It is mixed with water and flows out from the hot water supply pipe 6. When the hot water supply flow sensor 9 detects the start of hot water supply, the control unit 40 feedback-controls the opening degree of the hot water supply mixing valve 5 so that the hot water temperature detected by the hot water supply temperature sensor 8 matches the hot water supply set temperature. Hot water supply at a hot water supply set temperature is performed until the stopper 7 is closed.

  At this time, the control unit 40 calculates the hot water amount (heat amount) consumed for the hot water supply from the hot water supply flow rate, the hot water supply temperature, the hot water supply temperature, etc., and accumulates and stores the hot water supply results for the day. And the control part 40 is made to memorize | store the integrated hot water supply performance for multiple days (here 7 days) over multiple days (here 7 days).

<Bath operation>
Next, a bath operation when the bath automatic switch 37 of the remote controller 34 is operated will be described. When the bath automatic switch 37 is operated, the control unit 40 checks the water level detected by the water level sensor 19 to determine whether or not there is remaining hot water in the bathtub 15. The solenoid valve 21 is opened and the hot water supply mixing valve 5 is controlled so as to reach the bath set temperature, and the hot water filling of the hot water set amount is started.

  When the hot water supply flow rate sensor 9 counts the set amount of hot water filling, the hot water solenoid valve 21 is closed, and then the bath circulation pump 17 is driven, and the temperature of the bath water detected by the bath temperature sensor 18 is lower than the bath setting temperature. In this case, the bath circulation pump 17 is driven as it is, and the bath water reheating operation is performed. When the temperature of the bath water rises to the bath set temperature, the remote controller 34 notifies the completion of the hot water filling.

  At this time, the control unit 40 calculates the hot water amount (heat amount) consumed by the hot water filling from the hot water supply flow rate, the hot water supply temperature, the hot water supply temperature, etc., and accumulates and stores the hot water supply results for the day.

  On the other hand, when the bath automatic switch 37 is operated, if there is remaining hot water of the previous day in the bathtub 15 or if the reheating switch 38 is operated, the bath circulation pump 17 is driven to drive the bath water. When the temperature of the bath water detected by the bath temperature sensor 18 reaches the bath set temperature + α ° C., the bath circulation pump 18 is stopped and the remote controller 34 notifies the completion of the chasing.

<Boiling operation>
Next, the boiling operation will be described.
When the start time of a predetermined midnight time zone comes, the control unit 40 predicts the hot water supply load of the next day from the stored accumulated hot water supply results for the past plural days, and calculates the target hot water storage amount from the hot water supply load of the next day. Then, the hot water storage amount of the hot water storage tank 1 detected by the hot water storage temperature sensors 11a to 11e is subtracted from the target hot water storage amount, and the boiling target amount to be heated during the midnight time zone is calculated.

  The boiling temperature determining means 43 determines the boiling temperature Ta from the accumulated hot water supply results for the past plural days stored in the control unit 40 and the temperature detected by the feed water temperature sensor 10 or the outside air temperature sensor 32. Here, when there is a lot of past accumulated hot water supply results or when the feed water temperature and the outside air temperature are low, the boiling temperature Ta is determined to be a high temperature. The boiling temperature Ta is determined to be a low temperature. Here, the presence or absence of the reheating performance is not reflected in the determination of the boiling temperature Ta. However, when there is a reheating performance, it is difficult to raise the boiling temperature Ta slightly. is not.

  The control unit 40 calculates the required boiling time from the boiling temperature Ta, the calculated boiling target amount, the feed water temperature, and the heating capability of the heat pump heating means 33 stored in advance as numerical values, and the midnight The boiling start time is calculated by going back the boiling required time from the end time of the time zone.

  When the boiling start time arrives, the boiling control means 44 causes the compressor 27, the expansion valve 28, the blower fan 31, and the heating circulation so that the temperature detected by the boiling temperature sensor 26 coincides with the boiling temperature Ta. The pump 24 is driven to start the boiling operation by the heat pump cycle, and hot water heated to the boiling temperature Ta by the heat pump heating means 33 is stored from the upper part of the hot water storage tank 1.

  When the hot water storage temperature sensor 11e at the bottom of the hot water storage tank 1 detects a predetermined boiling end temperature or more, it is determined that the boiling has ended, and the boiling control means 44 determines that the compressor 27, the expansion valve 28, the blower fan 31, The heating circulation pump 24 is driven to stop and the boiling operation by the heat pump cycle is stopped. The boiling operation is stopped when the end time of the midnight time zone comes before the boiling is completed.

<Increased operation>
Next, the additional heating operation will be described.
When the end time of the midnight time zone comes, the boiling increase determination means 45 confirms the current hot water storage amount detected by the hot water storage temperature sensors 11a to 11e, and subtracts this hot water storage amount from the target hot water storage amount calculated according to the hot water supply load. The amount of deficiency is calculated, and the time required to boil the deficiency in the daytime period (predicted boiling time) is calculated from the deficiency, the boiling temperature Ta, the feed water temperature, and the heating capacity.

  When the hot water storage temperature sensor 11d located second from the bottom of the hot water storage tank 1 detects a predetermined temperature (here, 50 ° C.) or less, the boiling increase determination means 45 detects the water flowing into the lower part of the hot water storage tank 1 by the hot water supply. If a certain amount or more exists, it is determined that boiling can be performed. If the predicted boiling time remains, it is determined that the boiling operation is necessary.

  If it is determined that the reheating operation is necessary, the reheating control means 46 causes the compressor 27, the expansion valve 28, the blower fan 31, and the heating so that the temperature detected by the boiling temperature sensor 26 coincides with the reheating temperature Tb. The circulating pump 24 is driven to start the boiling operation by the heat pump cycle, and the hot water heated up to the temperature Tb by the heat pump heating means 33 is additionally stored from the upper part of the hot water storage tank 1. At this time, the boiling increase determination means 45 subtracts the execution duration time of the boiling increase operation from the predicted boiling increase time.

  When the hot water storage temperature sensor 11e at the lowermost part of the hot water storage tank 1 detects a predetermined boiling end temperature or more, or when the remaining time of the predicted boiling time becomes zero, the boiling increase control means 46 includes the compressor 27, the expansion valve. 28, stop driving of the blower fan 31 and the heating circulation pump 24 to stop the heating operation by the heat pump cycle.

  A method for determining the additional heating temperature Tb in the additional heating operation will be described based on the flowchart shown in FIG.

  First, when the end time of the midnight time zone is reached (step S1), the chasing execution time storage means 42 determines whether or not the chasing execution time t1 is stored (step S2). Alternatively, the earliest time at which tapping is carried out is selected from the plurality of times at which tapping is performed (step S3), and the earliest time at which tapping is carried out t1n is increased and output to temperature determining means 47. .

  Then, the boiling temperature determining means 47 calculates a time that is a fixed time (in this case, 3 hours) earlier than the earliest renewal execution time t1n in step S4 as a reheat temperature change time t2, and retreats in step S5. The service temperature Tn is calculated by adding a predetermined temperature to the boiling temperature Ta determined by the boiling temperature determining means 43.

  Then, it is determined whether or not the current time has increased and the temperature change time t2 has been reached (step S6). If the current temperature is before the increase temperature change time t2, the boiling temperature Tb is set as the boiling temperature Ta (step S7). If it is after the increased temperature change time t2, the boiling temperature Tb is set to the reheating temperature Tn calculated in step S5 (step S8).

  Here, the additional heating temperature determining means 43 only determines the additional heating temperature Tb, and whether or not the actual additional heating operation is necessary is determined by the additional boiling determining means 45, and the additional boiling determining means 45 is determined to be required to increase. In this case, the heating operation is performed at the heating temperature Tb determined by the heating temperature determining means 43.

  When the current time reaches a predetermined time t3 (here, the start time of the midnight time zone), the boiling temperature determining means 43 returns the boiling temperature Tb to the boiling temperature Ta determined by the boiling temperature determining means 43. (Step S9).

  On the other hand, when the renewal execution time storage means 42 does not store the renewal execution time t1 at step S2, the reheating temperature determination means 43 increases the reheating temperature Tb by the reheating temperature determination means 43. The temperature Ta is set all day (step S10).

  In this way, since the boiling point is changed to a higher temperature from the time zone before the time when the actual renewal performance was in the past, it is late at night until just before the time zone when the renewal operation will be started. It is heated and heated at a relatively low temperature, including the boiling temperature in the time zone, and heat loss radiated from the hot water storage tank can be reduced until the start of the reheating operation, and the reheating time Immediately before (predetermined time), the temperature is increased at the reheating temperature, and the capability of reheating operation can be ensured appropriately.

  In addition, the reheating time storage means 42 stores the time when the reheating operation for raising the temperature of the bath water to a predetermined temperature or more is performed, so that a large amount of heat is consumed in the reheating operation. When it is estimated that there is a need to increase the boiling temperature, when the boiling temperature is increased, the amount of heat consumed in reheating operation is low, and there is no need to increase the boiling temperature. Since the boiling temperature is not increased, the chance of unnecessarily increasing the temperature can be suppressed.

  In addition, this invention is not limited to said one Embodiment, It can change in the range which does not deviate from the summary of invention, For example, the bath heat exchanger 14 had the primary secondary flow path It is good also as a well-known structure which changes to a heat exchanger, arrange | positions out of the hot water storage tank 1, and distribute | circulates the hot water taken out from the upper part of the hot water storage tank 1 to the primary side.

  Further, the chasing execution time storage means 42 may be configured to store the chasing execution time by rounding it to a time of 30 minutes, or to store it by rounding it to a time of one hour unit.

DESCRIPTION OF SYMBOLS 1 Hot water storage tank 2 Water supply pipe 6 Hot water supply pipe 11a-e Hot water storage temperature sensor 14 Bath heat exchanger 15 Bath 16 Bath circulation circuit 17 Bath circulation pump 22 Heating circulation circuit 24 Heating circulation pump 26 Boiling temperature sensor 33 Heat pump type heating means (heating means)
41 Heating control means 42 Heating execution time storage means 43 Heating temperature determination means 44 Heating control means 45 Heating determination means 46 Heating control means 47 Heating temperature determination means t1 Heating execution time t1n The earliest tracking Implementation time t2 Heating temperature change time t3 Predetermined time (midnight time zone start time)
Ta Boiling temperature Tb Boiling temperature Tn Reheating temperature

Claims (4)

A hot water storage tank for storing hot water, a water supply pipe for supplying water to the lower part of the hot water storage tank, a hot water supply pipe for supplying hot water from the upper part of the hot water storage tank, heating means for heating the hot water in the hot water storage tank, and the lower part of the hot water storage tank A heating circulation circuit that connects the heating means and the upper part of the hot water storage tank, a heating circulation pump provided in the middle of the heating circulation circuit, and a bath heat exchanger that heats bath water using hot water in the hot water storage tank as a heat source A bath circulation circuit that connects the bathtub and the bath heat exchanger so that the bath water can circulate, a bath circulation pump provided in the middle of the bath circulation circuit, and hot water storage that detects the temperature of the hot water in the hot water storage tank A temperature sensor, a reheating control means for performing a reheating operation for driving the bath circulation pump to heat the bath water, and the earliest time at which the reheating operation was performed are stored for a plurality of past days. Reheating execution time storage means, boiling control means for driving the heating means and the heating circulation pump in the midnight time zone to perform boiling operation for storing hot water heated to the boiling temperature in the hot water storage tank, and past A boiling temperature determining means for determining the boiling temperature based on the actual hot water supply performance, a boiling determining means for determining whether or not additional heating is necessary based on the output of the hot water storage temperature sensor, and a time zone other than midnight If the boiling increase determining means determines that the boiling increase is necessary, the heating control means for driving the heating means and the heating circulation pump to store the hot water heated up to the boiling temperature in the hot water storage tank is performed. When the reheating execution time storage means does not store the renewal execution time, the boiling increase temperature is determined by the boiling temperature determination means. When the rebirth execution time storage means stores the rebirth execution time, the earliest time among the rebirth execution times stored in the rebirth execution time storage means is determined, A time earlier than the earliest time by a certain time is set as the reheating temperature change time, and during the time zone before this reheating temperature change time, the boiling temperature is determined by the boiling temperature determining means. And a reheating temperature determining means for setting the reheating temperature to a predetermined reheating temperature higher than the boiling temperature from the reheating temperature change time to a predetermined time. Hot water storage type hot water supply device characterized by   The hot water storage type hot water supply according to claim 1, wherein the reheating time storage means stores the time when a reheating operation is performed in which the temperature of the bath water is raised to a predetermined temperature or more. apparatus.   The hot water storage type hot water supply apparatus according to claim 1 or 2, wherein the predetermined reheating temperature is a temperature obtained by adding a predetermined temperature to the boiling temperature determined by the boiling temperature determining means.   4. The hot water storage type hot water supply apparatus according to claim 3, wherein, when the predetermined reheating temperature exceeds a predetermined upper limit temperature, the predetermined upper limit temperature is set as a predetermined reheating temperature.

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